Verilog program
module fsm1(clk, rst, inp, outp);
input clk, rst, inp;
output outp;
reg [1:0] state;
reg outp;
always @( posedge clk, posedge rst )
begin
if( rst )
state <= 2'b00;
else
begin
case( state )
2'b00:
begin
if( inp ) state <= 2'b01;
else state <= 2'b10;
end
2'b01:
begin
if( inp ) state <= 2'b11;
else state <= 2'b10;
end
2'b10:
begin
if( inp ) state <= 2'b01;
else state <= 2'b11;
end
2'b11:
begin
if( inp ) state <= 2'b01;
else state <= 2'b10;
end
endcase
end
end
always @(posedge clk, posedge rst)
begin
if( rst )
outp <= 0;
else if( state == 2'b11 )
outp <= 1;
else outp <= 0;
end
endmodule
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